hash-checker

File-integrity verification with CRC-32, MD5, SHA-1, SHA-2 and SHA-3, integrated into Windows file-properties dialog box.

Though console applications are open source (PAR clients are GPL), GUI application is closed source. Console applications and some UI resource are open source.

OpenHashTab is a shell extension for conveniently calculating and checking file hashes from file properties.

PeaZip is free file archiver utility, based on Open Source technologies of 7-Zip, p7zip, FreeArc, PAQ, and PEA projects, for Linux, macOS and Windows.

Open-source screen capture and file sharing tool with recording, editing, and annotation features. Supports 4K, dark mode, theming, offline use, and offers a lightweight, ad-free experience without tracking user data.

Solid Explorer is the best looking file and cloud manager with two independent panels, which brings to you a new file browsing experience.